Also tested on an older card, GeForce 7300 SE, with the latest driver version too, and got the same behavior with the DLLs... but that card can't handle the CRT shader anyway both are running on XP Pro SP3 machines, btw.

Interesting, how did you derive the paper-white gradient?The color values look like the 16 steps are tinted (in various directions) away from grey... and according to the 'Paper-White Phosphors' sidebar here, that may actually have some basis in how these monitors are designed. Didn't know that.

just a quick note about the patch.It's "wrong" to add to 2 different "SHELL_STARTUP_CGA" messages.Just give them a different a different name and do the selection at the point where they are being printed. (so where the MSG_Get is used)

The updated patch works for green, though F11 doesn't seem to cycle through anything; Dosbox is locked into green monochrome for me. Pressing f11 causing the message "hue at -x.xxxxxx" in increments of 5 for each keystroke, but does nothing in the actual DOSBox window.

*EDIT*Figured out the special keys problem, but F11 still does not cycle through the various palettes, and alt+f11 likewise has no function at all.